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13edcd1d MD |
1 | /* |
2 | * lttng-context-cpu-id.c | |
3 | * | |
4 | * LTTng CPU id context. | |
5 | * | |
6 | * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/sched.h> | |
13edcd1d MD |
26 | #include "lttng-events.h" |
27 | #include "wrapper/ringbuffer/frontend_types.h" | |
28 | #include "wrapper/vmalloc.h" | |
29 | #include "lttng-tracer.h" | |
30 | ||
31 | static | |
32 | size_t cpu_id_get_size(size_t offset) | |
33 | { | |
34 | size_t size = 0; | |
35 | ||
1c23b886 MD |
36 | size += lib_ring_buffer_align(offset, lttng_alignof(int)); |
37 | size += sizeof(int); | |
13edcd1d MD |
38 | return size; |
39 | } | |
40 | ||
41 | static | |
42 | void cpu_id_record(struct lttng_ctx_field *field, | |
43 | struct lib_ring_buffer_ctx *ctx, | |
44 | struct lttng_channel *chan) | |
45 | { | |
1c23b886 | 46 | int cpu; |
13edcd1d MD |
47 | |
48 | cpu = ctx->cpu; | |
49 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(cpu)); | |
50 | chan->ops->event_write(ctx, &cpu, sizeof(cpu)); | |
51 | } | |
52 | ||
53 | static | |
54 | void cpu_id_get_value(struct lttng_ctx_field *field, | |
79150a49 | 55 | struct lttng_probe_ctx *lttng_probe_ctx, |
13edcd1d MD |
56 | union lttng_ctx_value *value) |
57 | { | |
58 | value->s64 = smp_processor_id(); | |
59 | } | |
60 | ||
61 | int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx) | |
62 | { | |
63 | struct lttng_ctx_field *field; | |
64 | ||
65 | field = lttng_append_context(ctx); | |
66 | if (!field) | |
67 | return -ENOMEM; | |
68 | if (lttng_find_context(*ctx, "cpu_id")) { | |
69 | lttng_remove_context_field(ctx, field); | |
70 | return -EEXIST; | |
71 | } | |
72 | field->event_field.name = "cpu_id"; | |
73 | field->event_field.type.atype = atype_integer; | |
1c23b886 MD |
74 | field->event_field.type.u.basic.integer.size = sizeof(int) * CHAR_BIT; |
75 | field->event_field.type.u.basic.integer.alignment = lttng_alignof(int) * CHAR_BIT; | |
76 | field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(int); | |
13edcd1d MD |
77 | field->event_field.type.u.basic.integer.reverse_byte_order = 0; |
78 | field->event_field.type.u.basic.integer.base = 10; | |
79 | field->event_field.type.u.basic.integer.encoding = lttng_encode_none; | |
80 | field->get_size = cpu_id_get_size; | |
81 | field->record = cpu_id_record; | |
82 | field->get_value = cpu_id_get_value; | |
83 | lttng_context_update(*ctx); | |
84 | wrapper_vmalloc_sync_all(); | |
85 | return 0; | |
86 | } | |
87 | EXPORT_SYMBOL_GPL(lttng_add_cpu_id_to_ctx); |